Cotterman brand genuine factory direct replacement kit for rubber feet (crutch tips) on Cotterman rolling metal ladders, warehouse ladders, mobile ladder stands,step stands, stools, and StockNStore ladders. Smaller ladders have crutch tips on all four legs, most taller ladders with Cotterman safelock mechanism use feet only on the front leg. Crutch tips should be replaced whenever wear is noticed or if a tip is damaged. Whenever a tip has gone bad, all tips should be replaced so none of the tips are uneven and to ensure the ladder sits level when wheels are disengaged. GripTips are a proprietary design and should be the only crutch tips used on Cotterman rolling metal ladders – they are Custom made for Cotterman using an optimal durometer for grip and rigidity and a 1” internal bonded washer for added durability.