Black rubber butt caps in door knob shape for comfort.
| Model | ID | OD | Length |
| ARBC-12 | 1/2" | 29/32" | 1 5/8" |
| ARBC-18 | 45/64" | 15/16" | 1 5/8" |
| ARBC-19 | 3/4" | 15/16" | 1 5/8" |
| ARBC-20 | 4/5" | 15/16" | 1 5/8" |
| ARBC-22 | 7/8" | 1 1/16" | 1 7/8" |
| ARBC-23 | 15/16" | 1 1/16" | 1 7/8" |
| ARBC-24 | 31/32" | 1 1/16" | 1 7/8" |
| ARBC-25 | 1" | 1 1/4" | 1 7/8" |
| ARBC-27 | 1 1/16" | 1 1/4" | 1 7/8" |
| ARBC-28 | 1 1/8" | 1 1/4" | 1 7/8" |
| ARBC-32 | 1 1/4" | 1 7/16" | 2" |