Precision Toolmaker's Insert Vise Designed to be placed into a larger vise for working with very small work pieces. Features include... Jaw Width: 1" Jaw Opening: 3/4" Jaw Depth: 1/2" Height: 2.50" Overall Length: 2.56" Weight: 1 lbs Parallelism: within +0.0002" Squareness: within +0.0002" 440 Stainless Steel, Hardness 56 RC