Standard Bowling Ball Drilling Option  Ref: BD-01
The Standard (Houseball) Sizes that we use for drilling bowling balls are listed below. These sizes should equate houseballs that are marked Small, Medium, Large, etc but it is possible that houseball sizes may vary from these.
Extra Small:
- Thumb size 18.5mm (23/32") Approx. Ring Size Q + ½
- Finger size 16mm (5/8")
- Span 64mm ( 2½")
Small:
- Thumb size 20mm (25/32") Approx. Ring Size U
- Finger size 17.5mm (11/16")
- Span 73mm (2 7/8")
Medium:
- Thumb Size 21.5mm (27/32") Approx. Ring Size Y
- Finger size 20mm (25/32")
- Span 80mm (3 1/8")
Large:
- Thumb size 24.5mm (31/32")
- Finger size 21mm (13/16")
- Span 86mm (3 3/8")
Extra Large:
- Thumb size 26mm (1 1/32")
- Finger size 22.5mm ( 7/8")
- Span 89mm (3½")
XXL:
- Thumb size 28mm (1 3/32")
- Finger size 23mm (29/32")
- Span 89mm (3½")