When Lifting With This Clamp, Structured Steel Will Be Almost Perfectly Horizontal. When The Sling Wire Slackens Due To The Load Coming To Rest On The Floor, The Spring Loaded Intial Clamping Force Will Prevent The Clamp From Detaching From The Work Piece. It Is Not Necessary To Hold The Clamp After Set It Onto The Work Piece. The Wide Diameters Of The HLC Shackles Can Be Used Easily. The Main Body And Parts Are Made From Die-Forged Special Alloy Steels,Which Are Optimally Tempered For Maxium Strength And Durability. From A Mechanics, Point Of View, These Clamps Have Ideal Designs,Which Are Compact, Lightweight And Easy To Use. From A Mechanics Point Of View, These Clamps Have Ideal Designs, Which Are Compact , Lightweight And Easy To Use. 0812-4588-6539 The Arc Shaped Pad Can Provide A Stable Clamping Force.