Jorgensen 3524 24-Inch Aluminum Bar Clamp
A  lightweight bar clamp that has great strength/weight ratio. Ideal for fine woodworking, delicate assembling, and whenever lightness and strength are required. Doesn't react with glue or water to cause unsightly stains. Features 1-5/16-by-13/16-inch. extruded aluminum V-shaped channel with notches on 1-inch centers.