ZSI vibration-dampening Strut Clamp 304 ss for 1-1/4" copper tube max 1-3/8" OD Cush-A-Clamp series meets the standards for MSS, 1-13/16" long x 1⅝" wide, 1/4" bolt head, controlled squeeze design. Brand New. Grainger wants $33 each, my price $12 each cash / no tax or Box of 15 clamps for $150. firm.