This bleed screw kit is ideal for replacing damaged or broken bleed screws on Wilwood calipers. The kit comprises of 4 bleed screws complete with 1/4"-27 threaded bushes to fit into the caliper body. This thread is used on most Wilwood calipers. Please check your application for compatibility. This kit fits most Wilwood calipers and is ideal for replacing damaged or broken bleed screws. It is sold as a set of 4 and includes bleed screws and threaded bosses.