IRWIN Tools QUICK-GRIP Clamp Set, 8 Piece, 4935502 Mini Bar clamps exert up to 150 psi. of clamping pressure Handi-clamps feature QUICK-RELEASE triggers for fast and easy positioning All clamps constructed of high-tech reinforced resin for strength and durability Backed by the IRWIN Lifetime Guarantee Dimension: 22x16x2 inches