BOSTAL 21PCS Drill Bit Set 1/16 to 1/4 5/16 3/8 1/2 Professional Twist Drill Bits for Stainless Steel, Steel Wood Plastic Aluminum Alloy

Package Included: 1/16inch x 2PCS Drill Bit 3/32inch x 2PCS Drill bits 5/64inch x 2PCS Drill Bit 7/64inch x 2PCS Drill Bit 1/8inch x 2PCS Drill Bit 9/64 x 1PCS Drill Bit 5/32 x 1PCS Drill Bit 11/64 x 1PCS Drill Bit 3/16 x 1PCS Drill Bit 13/64 x 1PCS Drill Bit 7/32 x 1PCS Drill Bit 15/65 x 1PCS Drill Bit 1/4 x 1PCS Drill Bit 5/16 x 1PCS Drill Bit 3/8 x 1PCS Drill Bit 1/2 x 1PCS Drill Bit Total Quantity: 21pcs How to use this twist drill bits: ? Mini twist drill bit can NOT be used in the impact drill. ? To avoid drill bit break, 3/64mm and 1/16mm bits should be used with pin vise. ? 5/64", 3/32",7/64",1/8" bits can be used with power drill, with low speed and low drilling pressure. ?Mini drill bits please keep the rotary drill in low speed Product character: Material: Industry High Speed Steel Surface Treatment: Titanium Coated Tip Angle: 135degree with split-point Process: Full Ground Application: metal, wood, plastic, PVC, stainless steel and other handicraft industry drilling, high precision, improve efficiency. Working principle: the round hole of the workpiece is drilled through the rotary cutting of its relative fixed axis. How to Use Twist Drill Bits ?Make sure the drill in center, Ensure the left and right cutting edges of the drill are symmetrical when drilling. ?Observe the uniformity of the spark while drilling, adjust the pressure in time, and pay attention to the cooling of the bit. Why use Bostal drill bits Good quality and reliable brand. The bostal is OEM Manufactory for famous brand. The quality is prime. It is important than Price. Within 60 days product quality is not completely satisfied, please CONTACT US, 100% refund. 24-hour feedback excellent customer service