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. This set of holds are all under 7" which means they should fit most home 3D printers. The surface is textured with micro honeycomb.

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.