This bit has a cutting diameter of 3/4" And a cutting length of 3/4". Perfect for making dado grooves and all types of straight cut work. 1/4" Shank. Straight router bits are the most widely used and versatile bits in woodworking. They are ideal for joinery such as box joints, lap joints, dados, rabbets, mortises and Tenons. You can also use straight bits for trimming operations and CNC work.