THIS IS A PACKAGE DEAL WITH 2 ALL PURPOSE SKATES AND 2 MACHINERY SKATES. The all purposes skates are designed to help ease the resistance on your cable/winch when needing to pull on vehicles or equipment. With a 6 pound sledge hammer or heavier you can knock the skates by hitting on the heel of the skate which then allows the skate to go under the tire eliminating the tires surface. The machinery skate has a built in notch to allow a trailer hitch from dragging. The machinery skates also work great for eliminating tail pips from being scratch when the vehicle is dragging however both the all purpose skates and machinery skates have many uses and are designed for rough use and abuse! This combo package is also available in pink.