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The Jura by GRS Extended Set Plus with GRS MicroBlock is a comprehensive quick-change workholding system assembled from the remaining Jura by GRS inventory at Otto Frei β one of the last opportunities to acquire a complete, bench-ready Jura setup. With 33 line items built around a GRS MicroBlock, this set covers inside-ring holding, outside-ring holding, pin-hole jaws, shellac and Thermo-Loc methods, tapered and ball holders, watch bezel collets, cylinder tops, and multiple organizers to keep everything sorted and within reach.
Otto Frei began distributing Jura products in September 2015 and introduced the line to U.S. customers at the JCK show in 2016. GRS became the worldwide manufacturer and distributor of Jura by GRS products in late 2019, with shipments beginning in March 2020. Production stopped in March 2023, and Otto Frei purchased the remaining inventory directly from GRS on April 30, 2024. This Extended Set Plus represents that remaining stock β consolidated into one comprehensive package for shops that want broad fixture coverage from a system that is no longer in production.
The quick-change layout is designed to reduce setup time when moving between holding methods at the bench. Whether you are setting micro-stones, engraving, holding watch bezels, or working with irregular forms, the system moves cleanly from one configuration to the next without rebuilding from scratch.
| Set Configuration | Extended Set Plus |
|---|---|
| Workholding Platform | GRS MicroBlock |
| System Type | Quick-change modular workholding set |
| Application | Micro-stone setting and precision holding for rings, bezels, beads, and irregular forms |
| Included Line Items | 33 |
| Product Dimensions | 13 x 13 x 7 in (330.2 x 330.2 x 177.8 mm) |
| Brand | Jura by GRS |
| Item | Part # | Qty |
|---|---|---|
| GRS MicroBlock ready for Jura by GRS tools | 1 | |
| 500.509 Basic Quick Change Set | 129.980 | 1 |
| 500-018 MicroBlock Master Jaw Set | 500.018 | 1 |
| 500-010 Inside Ring Holder Jig Set Clamp | 129.985 | 1 |
| 500-011 Inside Ring Holder Screw Set | 129.995A | 1 |
| 500-504 10 Piece Expandable Collet Set | 129.995 | 1 |
| 500-007 Flat Clamp with Groove | 129.993 | 1 |
| 502-501 M6 Plate with M6 Thread & Screw | 129.989 | 1 |
| 500-523 Organizer for QC Basic Set | 500.523 | 1 |
| Set of 3 Bases for GRS MicroBlocks | 129.974 | 1 |
| 523-020 Hex Key | 129.974A | 1 |
| 523-016 Universal Holder | 129.974D | 1 |
| 523-015 Digital Caliper Holder β Scope Type | 129.974E | 1 |
| 500-006 Jaw Set with 3/32 in Pin Holes | 129.983 | 1 |
| 500-009 Outside Ring Holding Jaw Set | 129.984 | 1 |
| 500-001 Cylinder Top 6 mm with Groove | 129.985A | 1 |
| 500-002 Cylinder Top 10 mm | 129.985B | 1 |
| 500-004 Straight Top 20 mm | 129.986B | 1 |
| 500-005 Straight Top 40 mm | 129.986C | 1 |
| 500-014 Shellac Plate | 129.988 | 1 |
| 500-013 Thermo-Loc Jaw Clamps | 129.990 | 1 |
| 500-506 Ball Holders | 129.991A | 1 |
| 500-507 Tapered Holders | 129.991B | 1 |
| 502-015 Shellac/Thermo-Loc Knurled Cylinder | 129.992A | 1 |
| 502-502 Shellac/Thermo-Loc Triangle Cylinder | 129.992B | 1 |
| 500-012 Watch Bezel Collets | 500.012 | 1 |
| 500-524 Organizer for QC Holders/Clamps | 500.524 | 1 |
| 502-045 Sweeping Brush Holder | 502.045 | 1 |
| 502-518 Thermo Loc Clamps for 3X Line | 502.518 | 1 |
| 523-012 Organizer Tapered Holders | 523.012 | 1 |
| 523-013 Organizer Shellac Plates | 523.013 | 1 |
| 523-029 Digital Divider Stick-On-Bench Holder | 523.029 | 1 |
Designed around the GRS MicroBlock and compatible with Jura by GRS quick-change tools and holders included in the set. Shellac- and thermoplastic-based holding methods are supported where specified, including use with Thermo-Loc, Jett-Set, or traditional shellac.
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