Standard Pack = 1 piece(s). Graduation = 0.0005 IN; Measuring Range = 0.06 IN; Set Contains = Mag Base With MicroFine Adjustment Screw, 3-9/16 Extension Arm, Dovetail Mounting, .060 IN Range X-Test Indicator .0005 IN Graduation, 3 Carbide Points In Case; Type = X-Test Extra Mag Base Combo;