1Eccentric Drill Set: High strength eccentric twist drill bit, made of hard high speed tungsten steel M35, clean and incisive in drilling, and can penetrate metal, brick, glass, ceramic tile, plastic, wood and other materials. 2Efficient and Accurate: The skewed head eccentric bit design ensures more stable locating, lower resistance, and better water drilling effect. The fine grinding drill tip effectively prevents slipping and deflection. 31/4 Inch Hex Shank: These eccentric bits features a standard 1/4 inch hex shank, making them easy to install on various types of power drills, hand drills, bench drills, etc. With a stable and reliable structure, and high efficiency. 4Fast Chip Removal: The unique eccentric edges design can easily penetrate various materials, and the U shaped rotating groove effectively prevents chip accumulation and retention, ensuring neat and fast drilling. 5Specifications: This kit provides 8pcs skewed head eccentric bits with 4 different sizes, namely 1/4 inch (6mm), 5/16 inch (8mm), 3/8 inch (10mm), and 1/2 inch (12mm), to adapt to different scenarios and meet various drilling needs. 8 x Drill Bits 1 x Storage Box