We have both step drag bits and non-step drag bits (chevron drag bits): Step type drag bits are the most common type of drag bit used in the world today. They are primarily designed for soft to medium formations; Chevron drag bits are designed for medium to hard formations and are used in areas that contain a lot of rock and also in the oilfield for drilling out concrete casings and plugs.
Our diameters is fom 65mm to 450mm for both three wings and four wings design. Our connect threads are usually NROD pin,2 3/8" API Reg pin, 2 7/8" API Reg pin, 2 7/8" API Reg IF, 3 1/2" API Reg pin, 4 1/2" API Reg pin, 6 5/8" API Reg pin,etc.