M66-10 Foot Block.   Computer machined anodized aluminum body utilizes Torlon (tm) Rollers and Delrin (tm) Ball Bearings for an incredibly smooth and reliable block.  Length 3-11/16" (94mm), Width 2-5/8" (66mm), Thickness 1-3/32" (27mm), Weight 7.2 oz (204gm), Safe Working Load 2800 lbs (1270 kg)