CRAWFORD Adapter set hex -25,4mm

This is a shaft‑conversion kit used to adapt a hexagonal torsion shaft (typically Crawford‑style 25 mm or 35 mm hex) to a 25.4 mm round shaft — which is exactly 1 inch.

It’s the part you use when the door has a hex shaft, but the operator, brake, or coupler you’re installing requires a 1‑inch round input.