Gold (small) = 9.8 mm – Suit 3/8 spindle and 1/4 inch bowl gouges Blue (medium) = 13.2 mm – Suit 1/2″ spindle gouges and 3/8 bowl gouges and any bar from 12.5mm to 13.2mm in diameter Red (large) = 16.2 mm – Suit 1/2″ bowl gouges and 5/8 to 16mm diameter bars These heads are only suitable for the Simon Hope Deluxe Quick Release Handles
