Precision Screwless Sine Vise Provides a quick and accurate means of holding a workpiece at an angle for machining, drilling and grinding Accuracy is further enhanced by the fact that the center distance between the holes is held within 0.0002" Small angles can be set easily and accurately by using standard gauge block sets because of the built-in 0.200" minute steps ( the distance between the center of the rolls and the top of the vise changes by 0.200" for every 1 degree of angle) Made of hardened solid steel All surfaces hardened and ground. Adjusts 0-45° Square and parallel within 0.0002" The material of the precision angle plate are: 20CrMnTi ( C:0.17-0.23; Si: 0.17-0.37; Mn:0.8-1.1; Cr: 1.00-1.30; Ti: 0.04-0.10) Item Dimension L x W x H Center Distance of Rolls Sq. & Parallel Jaw Capacity Jaw Height BA66-0420 7.48"x2.87"x4.13" 5.000" within 0.0002" 0.0002" 0-3.94" 1.38" BA66-0425 9.65"x3.94"x5" 10.000 within 0.0002" 0.0003" 0-5.12" 1.77"