Woodys Executive Series Flat-Top Carbide Runners WPI-1300 Designed for aggressive trail riders and racers 1/2in. diameter host runner features a full 8in. of 60 degree sharp edge turning carbide 1 1/2in. carbide wear pads front and rear and full-length hardweld surfaces between all three carbide inserts ensure extended wear Extra-long studs make it easy to install plastic ski skins Track studding required