6542 High-speed Steel 10.5mm Twist Drill Bit 200mm Length Black Oxide Pins 4 Pole 5 Position dual

4 Pole 5 Position dual decks design

Roller Size: 74x23mm / 2

Mounting Size: 43*38mm

This type of casement window hinge should be installed on the upper and lower sides of the window

pure copper wire core

6542 High-speed Steel 10.5mm Twist Drill Bit 200mm Length Black Oxide Pins 4 Pole 5 Position dual1. It is made of 6542 HSS (high speed steel) steel, which has good toughness and hardness, is not easy to break, and is easy to remove chips. Black oxide surface treatment, good rust resistance long durability. 2. The spiral groove design can avoid the displacement of the drill bit during the working process, and at the same time, the debris can be removed more quickly and easily. Sharp cutting edges provide smooth cutting without burrs. 3. The twist