Description Characteristics of wing drills Number of wings, pcs.: 4 Drill Diameter, mm: 110,165,190,210 Keystone Thread Type: Taper Keystone material: st. 45 Turnkey milling, mm: 55 Priming / painting: YES Note, threads are different - contact first Types and type of construction Three-wing drill bits are usually used for drilling with small-size drill rigs. The choice of three auger blades is due to the stabilization of the drill pipe column and the reduction of the load on each wing separately. The wings are set at an angle of 120 degrees to each other. The main load during drilling falls on the cutting edges of the drill. The drills are made with two types of blades: HDBS (hard alloy plates) and soaking with T590 electrodes. Drill bits with HDBS hard alloy plates have increased wear resistance when drilling in soil up to 4 categories (sand and clay). The augers are very efficient. How to choose the diameter of the auger? The choice of wing drill diameter depends on the diameter of the casing pipes used during the borehole casing. The diameter of the auger should exceed the diameter of the housing by 15-25%. Wing bite drill diameter: 80-250mm