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: 13/16" Jaw Depth: 3/8" Height: 1-3/16" Overall Length: 2.55" Weight: 1 lbs Parallelism: within 0.0001" Squareness: within 0.0001"