Weha Radial Arm Finger Tip — Reverse Thread (20x23xM12) | Single Head | Granite, Marble & Quartz

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The Weha Radial Arm Finger Tip (Reverse Thread, 20x23xM12) is a single-head diamond finger tip for edge profiling on granite, marble, quartz, and quartzite using radial arm machine s. This is the reverse thread version — required for left-hand spindles on radial arm machines where standard right-hand thread finger tips would unscrew during operation. Compatible with Fab King and similar single-head radial arm setups. Use for edge profiling, sink cutouts, and countertop edge shaping. Standard vs. Incremental — Which Do You Need? Weha offers two reverse thread finger tip options in the 20x23xM12 format: This product (SKU 30515RV) — Standard reverse thread finger tip for general edge profiling on granite, marble, and quartz Incremental Quartzite version (SKU 30517RV) — Stepped segment design for harder materials like quartzite where single-pass profiling risks chipping Reverse Thread — Why It Matters On radial arm machines, spindle rotation direction determines whether a standard or reverse thread finger tip is required. Using the wrong thread direction causes the finger tip to unscrew during operation — a safety hazard and source of tool damage. Always confirm your machine’s spindle direction before ordering. Specifications SKU: 30515RV Thread: Reverse M12 (left-hand) Head type: Single head Compatible machines: Fab King, radial arm machines with M12 spindle Applications: Granite, marble, quartz, quartzite, sink cutouts, edge profiling Weight: 0.2 lb Works Well With Weha Radial Arm Finger Tip (20x23xM12) — Standard thread version for right-hand spindles Weha Incremental Quartzite Radial Arm Finger Tip (Reverse Thread) — For quartzite and hard stone Weha Radial Arm Finger Tip (1/2 Gas x 12mm) — Alternative thread adapter Weha Vacuum Brazed Zero Tolerance Wheel — Profile wheel for radial arm use Weha Rock Dog Router — Stone profiling machine Further Reading Which Weha Finger Bit Do You Need? CNC vs Radial Arm — Complete Buying Guide → — Full comparison of all Weha finger bits and finger tips by machine type, material, and application. Show more