Originally drilled for 1-handed bowling, then the thumb was plugged for 2-handed use. Easily converted back to 1-handed by drilling the plugged thumb hole to your span, or leave as-is for 2-handed bowling.
NIB 15# Roto Grip RST Hyperdrive Bowling Ball- 15.3/3.5-4" Pin/3.04oz TW
Roto-Grip RST X-3 Bowling Ball 15 LB. 1ST QUALITY NEW UNDRILLED. #199
Roto Grip RST Hyperdrive bowling ball 15 LB NEW IN BOX #025
Roto Grip RST Hyperdrive Bowling Ball Mango/Magenta/Royal
