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# Brunswick Danger Zone Black Solid Bowling Ball 15.3/2-3" Pin/2.70oz TW
NIB 15# Brunswick Danger Zone Black Solid Bowling Ball 15.2/3-4" Pin/2.60oz TW
BRUNSWICK DANGER ZONE BOWLING BALL 15 POUNDS SYMMETRIC #HTR1486B
Brunswick Johnny Petraglia Black Brunswick LT 48 1971 15 Lb 2 Ounces
NIB 14# Brunswick Danger Zone Black Solid Bowling Ball 14.0/2-3" Pin/3.00oz TW
Vintage 90's Brunswick DANGER ZONE Bowling Ball. 10lbs 3.6oz
