7/16" x 3-1/8" Carbide Tipped Countersink Bit with Slow Spiral Stepped Drill, 5/16" Shank

Features:
• 7/16" countersink bit
• Available in a wide variety of sizes, complete with slow spiral HSS M2 DIN 338 fully ground stepped drill bit
• #8 screw for hard wood
• #9-#10 screw for soft wood

Excellent for Drilling:
• Natural Woods
• Man-Made Boards
• MDF
• Chipboard
• Plywood
• Aluminum/Non-Ferrous
• Aluminum Composite Material (ACM)
• Composites
• Composite Decking Materials
• High Density Polyethylene (HDPE)

Warning: When drilling aluminum/non-ferrous materials, for optimal results and extended tool life use lubricant or air cooling. Make sure the material is fixed and drill is stable during drilling.

Drilling countersinks with these bits on the CNC machine is a great way to save time and have your pieces look great every time. With the adjustable depth drill bit you can adjust them for whatever size material you're working with. They are best used with a drilling toolpath, utilizing the peck drill option at 0.25" per pass with a 0.125" retract height. For best results run at 3,000 RPM with a 30 IPM (Inches Per Minute) plunge rate. No feed rate needs to be set with these as they only move up and down with the Z axis, not side to side. If your software doesn't allow a 0 feed rate, you can enter 1 IPM (Inch Per Minute) in the feed rate as a placeholder.

• For countersinks with 1/4" round shank, use 1/4" spring collet
• For countersinks with 5/16" round shank, use 7-8mm spring collet
• For countersinks with 3/8" round shank, use 9-10mm spring collet