Description: Product Specifications: The Forstner drill bit set is made of high speed carbon steel, strong and sturdy.Unique Design: The design ensures reduced friction and heat, optimizing chip removal and extending the lifespan of the tool.Premium Material: Made from carbon steel, this set is sturdy and premium, providing long term effective performance during continuous drilling.Center Point: The Forstner drill bit's center point allows for positioning without slipping while the round edge design ensures drilling of the desired circular shape in all aspects.Wide Application: This set is great for drilling holes in softwood or hardwood, single board , chipboard etc., making it suitable for beginners as well as professional carpenters. Specification: Material: Carbon Steel Size Chart: 1/4 inch(6.3mm), 3/8inch(9.5mm), 1/2inch(12 .7mm), 5/8inch(15 .8mm), 3/4inch(19 .0mm), 7/8inch(22 .2mm), 1inch(25 .4mm), and 1-3 /8inches(34 .9mm) Package Includes: 8 Piece Forstner Bit Set Note: Please allow slightly errors 1-2cm differences due to manual measurement.