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.
Used 15lb RH Roto Grip RST HYPER DRIVE SOLID D/D
Roto Grip Roto Grip RST Hyperdrive Pearl bowling ball 15 LB. NEW IN BOX #143
Roto Grip Roto Grip RST Hyperdrive PearL 1ST QUALITY bowling ball 16 LB NIB
Roto Grip Roto Grip RST Hyperdrive PearL bowling ball 15 LB 11oz NEW IN BOX
Roto Grip RST Hyperdrive Solid 15lbs Switch Grip Right Handed Bowling Ball
Roto Grip RST Hyperdrive bowling ball 15 LB NEW IN BOX #025
