Premium Material Composition: Crafted with M35 grade high-speed steel combined with 5% Cobalt, enhancing strength and heat resistance. Comprehensive Set: Includes an 8-piece set with sizes ranging from 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", to 1", housed in a fitted plastic box for easy organization and protection. Advanced Design: Features 135° split point drills that initiate contact without the need for a pilot hole, reducing drill bit walking and ensuring precise, efficient drilling. Optimized for Tough Materials: Ideal for drilling into hard materials, including cast iron, heat-treated steel, stainless steel, and other hard materials, offering faster cutting speeds and extended tool life. Enhanced Compatibility and Stability: Straight shank design with 3-equal-flats ensures a secure grip in 1/2" chucks, reducing slippage and increasing stability during heavy-duty drilling tasks. 135° split point drills do not require spot before drilling to prevent walking. The cobalt 135° split point drills last longer, cut faster and enable much less wobble than standard HSS 118° point drills. Straight shank with 3 equal flats to fit 1/2" chucks.