Equalizer Industries, Inc., offers a variety of urethane cutting knives. Our newest set contains one each of the 9 , 14 , 18 and 24 long knives. These assorted sizes provide the technician with a knife to meet every need when cutting urethane. All the knives in our Urethane Cutting Knife Set are constructed from high-strength anodized aluminum and also incorporate a stainless steel nut and screw to reduce stripped threads, improving the longevity of the knives. The blade holder is a unique design that has a built in pin to hold the U-notches of the utility knife blade. There is no roll pin to work loose. If the pin ever wears out, just replace the blade holder and you have a new pin. These urethane cutting knives use regular utility knife blades (part number UKB498) and extra long utility knife blades (part numbers ULB582 and DD1086). Purchasing the set (LFG1484) will save you money, but each size knife is also available to purchase seperately if needed. Each knife comes with one standard utility knife blade.