Mike,
Round material needs a diameter of the largest rectangular size for the same size knife. For example: A RMK Model #1-7" requires rectangular stock measuring: 1 1/8"x 1 1/4"x 4 3/4". Round stock needs to be: 1 1/4" (diameter) X 4 3/4" long.
Hope this helps, Capt. Chris
_________________________
Capt.Chris Stanaback
RKCC/RKCA Founder
RKS #016
NRA Lifetime Member
CAPTSTANABACK@aol.com
WEBSITE: www.captstanaback.com