90 Degree Countersink Drill Bit 6-Piece Set Three-Blade Fully Ground Chamfering Tool Bit Countersink for Metal

90 Degree Countersink Drill Bit 6-Piece Set Three-blade Fully Ground Chamfering Tool Bit Countersink for Metal Instructions 1. Drill the center hole. First use other drill bits to drill a small hole for positioning, and use a countersunk drill with a larger depth. 2. Use a chamfer to drill the hole that matches the size of the nut, and measure it with a caliper while drilling. 3. Install to the bench drill_upper chamfer 4. After finishing drilling, screw on the screws, parallel to the horizontal plane. 5.Tighten the screws and be flush with the horizontal plane Precautions 1. During operation, it is necessary to cool the chamferer while operating (water injection, cutting oil, blowing and compression are possible Air), otherwise the drill bit will be burnt out at a fixed temperature. 2. This chamfering device needs to be operated on a bench drill. If the hand drill is operated, it is easy to shake, which will affect Chamfering effect.

• Material: High Speed Steel HSS (4241)
• Shank type: round, Sizes: 6.3 8.3 10.4 12.4 16.5 20.5mm
• Mutiple Application - Ideal for wooden planks,fiberboard,particle board,plywood, 90 degrees angle on the point for sharp and precise countersinking, used for workpiece circular aperture chamfering or cone hole
• Note: This drill should use a bench drill, which is easy to shake. If you use a manual drill, it will affect the chamfering effect
• Package Content: 6-piece set in iron box