Bordo's Deck Bits are fully adjustable to suit your specific fastener, timber species or custom application. Additionally Deck Bits feature: • Pilot hole to suit 10G or 14G screws. • Prevent decking timber splitting. • Adjustable, free spinning, non-marking collar. • Wide gullets prevent the jamming and clogging of wood chips. • Large gullets also provide an unobscured view of the operation. • Replaceable HSS pilot drill. • Heavy duty hex shank ensures maximum torque transfer & eliminates chuck slip