High Speed Knurls for #10, #19 and #20 Holders:

AD (Diamond Knurls): An L&R are required to make up a set in the Knurling Tool.
AS (Straight Knurls): 2 are required in the Knurling Tool.
ACD (Convex Diamond, Cobalt, Tin Coated): An L&R are required to make up a set in the Knurling Tool.
ACS (Convex Straight, Cobalt, Tin Coated): 2 are required in the Knurling Tool.