Suburban Tool Master-Sine Sine-Plates

• (FORMERLY BY EX-CELL-0 / ROBBINS)
• Master-Sine sine plates provide a sturdy and accurate way to grind or measure angles.
• Made of steel, hardened to Rc 58-60.
• B-3-SP and B-5-SP have 1/4-20 tapped holes. The remaining models have 5/16-18.
• The roll bar is made from hardened steel, ground and lapped for straightness and roundness.
• Swivel block provides full face contact with gage blocks, keeping them securely in place.
• Exclusive locking device inside the hinge roll provides a positive lock with an expanding action. Both screws lock toward the front of the unit, pulling the top plate down on the set-up gage blocks without distortion. Hinge is made from hardened steel, ground and lapped.
• Angular accuracy of set-ups is guaranteed to be within 5 seconds of arc up to 15, 10 seconds up to 30 and 15 seconds up to 45.
• Side and back rail included.