R-04*05 for size 1/4" x 5/16"
R-04*06 for size 1/4" x 3/8"
R-04*08 for size 1/4" x 1/2"
R-05*04 for size 5/16" x 1/4"
R-06*04 for size 3/8" x 1/4"
R-06*08 for size 3/8" x 1/2"
R-06*10 for size 3/8 x 5/8"
R-08*04 for size 1/2" x 1/4"
R-08*06 for size 1/2" x 3/8"
R-08*10 for size 1/2" x 5/8"
R-10*08 for size 5/8" x 1/2"
R-10*12 for size 5/8" x 3/4"
R-12*08 for size 3/4" x 1/2"
R-12*10 for size 3/4" x 5/8"