Description: Wing Bit Characteristics: Number of wings (pcs): 3 Bit diameter (mm): 165 Bit thread type: Conical Bit material: st. 45 Milling for drill key (mm): 55 Priming/painting: YES Note: threads vary - contact us first. Design Types and Design: Three-wing bits are typically used for drilling with small-sized drill rigs. The choice of three bit blades is to stabilize the drill pipe column and reduce the load on each wing individually. The wings are set at a 120-degree angle to each other. The main load during drilling falls on the bit's cutting edges. The bits are made with two types of blades: VK8 (hard alloy inserts) and T590 electrodes. Bits with VK8 hard alloy inserts have increased wear resistance when drilling in soils up to category 4 (sand and clay). T590 bits with a burnishing tip are slightly less efficient but less expensive and allow for self-repair of the cutting edge. How to choose the bit diameter? The choice of wing bit diameter depends on the diameter of the casing used in the well casing. The bit diameter should exceed the casing diameter by 15-25%.