ITEM NAME:6 pcs HSS High Speed White Steel Twist Drill Metal Bit Set For Rotary Tool Best Descriptio n Description: Features: 1. The straight shank twist drill is mainly composed of a handle and a working part. The guiding portion of the working portion serves as a guiding and grinding action, and the chip pocket is spiraled to facilitate the guiding of the chips. 2. HSS, also known as high speed steel, is a commonly used material for tooling tools. 3. It is suitable for drilling holes in angle iron, wood, plastic, aluminum alloy and other materials. Home is more suitable. Specifications:.HSS, also known as high speed steel, is a commonly used material for tooling tools. Material: HSS. The straight shank twist drill is mainly composed of a handle and a working part. It is suitable for drilling holes in angle iron, wood, plastic, aluminum alloy and other materials.