CRB door-knob butt cap CRBC-30 (size 30 mm) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/crb-door-knob-butt-cap-crbc-30/  (sheet CC BY 4.0)
Basis: Secondary source: Mud Hole Custom Tackle (CRB) (copy of the maker's figures; the maker publishes none directly)
Catalog version: 2026-10-20

Overall (mm): length 41.91, width 41.91, height 54.61
- CRB's door-knob butt cap fits over a grip or butt of about 30 mm; Mud Hole publishes ID, OD and length.
- The rounded knob profile and bore depth are not published, so only an envelope with the bore diameter can be built.
- Retailer/brand-owner Mud Hole is the only source (secondary).
- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.
- Secondary source: the numbers come from a retailer or magazine copy of the maker's specification.

dimension  value
Nominal size  30 mm
Inside diameter  29.97 mm (1.18 in)
Outside diameter  41.91 mm (1.65 in)
Length  54.61 mm (2.15 in)
Bore depth  not published

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Mud Hole Custom Tackle (CRB): CRB Door Knob Style Butt Caps - size chart — web — Publisher's page; dimensions are facts — https://mudhole.com/en-ca/products/crb-door-knob-style-butt-caps

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/crb-door-knob-butt-cap-crbc-30/index.json
API: https://xemstudio.com/api/geometry?object=crb-door-knob-butt-cap-crbc-30