CMT 657.994.11B Pattern/Flush Trim Bits w/Insert Knives 3/4" x 1-31/32" S=1/2"The CMT 657. 994. 11B is a 3 4 inch pattern and flush trim router bit with insert knives, double bearing, and 1 2 inch shank. Long 1 31 32 inch cutting length. The double bearing provides extra stability on difficult flush and pattern trimming operations. SPECIFICATIONS Order Number 657. 994. 11B Cutting Diameter 3 4" Cutting Length (I) 1 31 32" Shank Diameter 1 2" Overall Length 4 11 32" Number of Knives 2 Knife Type Reversible Insert Knives