Amana Tool 45795 V-Groove 108 Deg. Folding for Aluminum Composite Material (ACM) Panels Like Alucobond, Dibond, 0.090 Tip Cut Width x 3/8 CH x 1/2 D x 1/4 Inch SHK Carbide Tipped Router Bit Carbide Tipped 1/4 Inch Shank Benefits of Zirconium Nitride (ZrN) Coating Creates a harder and tougher cutting edge allows for a prolonged cutting edge life and helps to prevent the build-up of material in the flutes while cutting Have the tendency to run/spin much faster than an uncoated tool Optimized flute geometry and low Total Indicated Runout (TIR) guarantees clean cuts, essentially eliminates sanding and reduces chatter (where the machine or work piece vibrates) under high chip loads (when used with low TIR spindles SPECIFICATIONS: Diameter (D): 1/2 Angle (a): 108 Cutting Height (B): 3/8 Shank (d): 1/4 Overall Length (L): 2 B1: 5/32 Type: Carbide Tipped V-Groove Max RPM: 35,000 Flutes: 2 D1: 0.090" a1: 36