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vakuole42
These indoor rock climbing holds are designed to match professional-style grips that you'll find in a commercial indoor rock climbing gym. Commercially real world holds are made with a proprietary plastic/epoxy mix, but can also be carved from wood or actual rock.
The hole provided in the model is designed to fit 3/8-16 Socket Head Cap Screws with various lengths, similar to what you'll find in the commercial gyms. The washer is 7/8" in diameter. The bolt and washer shown in the preview images are only for scale and reference. No model of a socket head cap screw or washer is provided with this file.