ITEM NAME:1/4" Shank Straight, Pattern Flush Trim Router Bit Cutter Top Bottom Bearing Description: Blue: Great for combined plunge-cutting and pattern/template routing. For increased work piece visibility,use shank bearing flush trim bit in a handheld router allowing the template to be positioned on top of the work piece. In a router table, template will be positioned underneath the work piece, can also be used without the bearing as a standard straight bit. Yellow: Top and Bottom Bearing Router Bit is great for all your large stock trim applicatons, can be used with either a top or bottom template. Especially useful for template work when routing rounded orcurvy wood with sensitive end-grains. Specification: Blue: Two flute car.Total length: Approx. 44mm (1-3/4").