Red YT-160A Double Head Sheet Metal Nibbler Cutter Drill Attachment Metal Sheet Cutter for Electric Drill. Features: -There are two cutter heads for adjustable head cutting. -The cutter head can be positioned 360 degrees in any direction. -Optional 8mm electric or pneumatic drill, speed 1500-3000 rev / min. Instructions: 1.When using the thin plate hole opener, first insert the drill front end and the cutter into the round hole of the hole opener, connect the cutter to the electric drill and lock it tightly, then put the three branches on the shelf and the stud screws tightly. In order to prevent the hole opener from sliding; insert the left and right positioning pins upward into the small square hole of the shelf, and finally adjust and tighten the tight screw according to the size of the arc to be cut, and fix the ruler Prison to ensure the accuracy of cutting round holes. 2.When cutting a standard arc, a thin-plate hole opener should be used to ensure that the circular cut surface is smooth and beautiful. It should also be drilled with a 3 mm positioning eye first, and then drill a 12 mm hole to extend the cutter head into the hole. Cut the inner and outer circles. Operational Requirements: 1.It is especially important to cut the aluminum plate at the blade edge. 2.After the electric drill is first opened, the electric drill is turned off after the end of the cutting. 3.The cutting edge of the cutter bar must be perpendicular to the workpiece to be cut during cutting to prevent the hard head from breaking the cutter head. Specification: Fit For Electric Drill Color: Red; Material : Metal, Plastic; Color : Black, Silver Tone; Cutting Diameter : 7.4mm / 0.3"; Handle Diameter : 33mm; Overall Size : 18 x 5.0 x 7.6cm / 7" x 2" x 3" (L*W*H); Suitable for car repair and maintenance and metal sheet productions. Allow Cutting Thickness: Ordinary iron plate: 1.8mm; Stainless steel plate: 1.2mm; Copper, aluminum plate: 2mm; Plastic plywood car: 2mm; Package Included: 1 x Metal Nibbler Cutter; 1 x Allen Wrench.