Starrett Universal Snug 58S
56613
With spindle hole diameters 1/4", 5/16", 3/8" (6.3, 8, 9.5mm). Gripping hole diameters range from 3/32-1/4"used on holders with smaller clamp hole. universal Snug: 1/4”, 5/16”, 3/8” Spindle Hole Diameters.
Snug
