Specifications: 16PCS includes 1/4" (6.3mm), 3/8" (9.5mm), 1/2" (12.7mm), 5/8" (15.8mm), 3/4" (19.0mm), 7/8" (22.2mm), 1" (25.4mm), 1-1/8" (28.5mm), 1-1/4" (31.7mm), 1-3/8" (34.9mm) ,1-1/2(38.1mm), 1-5/8(41.28mm), 1-3/4(44.45mm), 1-7/8(47.63mm), 2(50.8mm) and 2-1/8(53.98mm) forstner bits Features: 3/8" Hex Shank is easy to install and tighten ,prevent the bit from slipping. Extra sharp cutting spurs is especially designed for cutting through hard and soft wood or other materials smoothly and efficiently. Great performance: Easily make flat-bottomed and pocket holes with no chipping on any wood or wood products, plastic, polywood and other materials during processing or installation. High quality: Good material assures toughness and good resistance to shock,reduces cutting time. Application: Hex shank fits any electric power machines and drill presses. 8PCS Specifications: 8Pcs Forstner Bit Set: 11/4" (6.3mm), 3/8" (9.5mm), 1/2" (12.7mm), 5/8" (15.8mm), 3/4" (19.0mm), 7/8" (22.2mm), 1" (25.4mm), 1-3/8" (34.9mm) Extra Sharp Cutting Spurs: Extra sharp cutting spurs is especially designed for cutting through hard and soft wood or other materials smoothly and efficiently. Widly Used: Easily make flat-bottomed and pocket holes with no chipping on any wood or wood products, plastic, plywood and other materials. CORTOOL Forstner Bits 8pcs Hex Shank Wood Drill Bit Sets specifications: 8pcs:1/4" (6.3mm), 3/8" (9.5mm), 1/2" (12.7mm), 5/8" (15.8mm), 3/4" (19.0mm), 7/8" (22.2mm), 1" (25.4mm), 1-3/8" (34.9mm) forstner bits,1 pc each. Packing:Blow Molding Plastic Box Material:HCS Shank Type: Hex Shank Instructions: Always read and follow the operating & safty instructions of power tools for use of this accessory. Precautions: make sure to put on masks and other appropriate satty items for protection. Keep cool or Discontinuous use will largely prolong drill life. High performace and reliable quality to be promised by CORTOOL!