Description Characteristics of wing drills Number of wings, pcs.: 3 Drill diameter, mm: 110 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: VK8 (hard alloy plates) and T590 electrode soaking. VK8 hard alloy tile drills have increased wear resistance when drilling in soil up to 4 categories (sand and clay). The T590 soaking augers are slightly less efficient, but less expensive and allow you to repair the cutting edge yourself. 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%.