Effectively "cancels" the angle being measured to check its accuracy. Made of steel, hardened to Rc 58-62. Ground flat, square and parallel within 0.0002". The end rail is included and can be mounted at either end.

MODEL #	DIMENSIONS	ROLL CENTER DISTANCE	WT(#)
SB-111 SB-111O	6" x 1" x 1-11/16" 11" x 1-1/8" x 2-1/16"	5,000 within .0001" 10,000 within .0001"	2 5

SPECIAL SIZES AVAILABLE UPON REQUEST