Brake Blocks for Oilwell Drilling and Servicing Drawworks. Experts in the Oilfield Prefer Us. Flexibility, Smoothness and Perfect Shape for Better Braking and Sure Grip. No Fade. Constant Friction Coefficient. Perfect Heat Dissipation Which Keeps the Brake Drum Cool. Heavy Woven Density Which Provides Minimum Block and Drum Wear. USA Distributor/Stewart & Stevenson.