Stainless steel blind threaded anchor fitting for wooden spearguns, with a fine threaded interior for metric parallel screws.
Perfect for wooden speargun builds or modifications when an often removed fitting is required, eg reels.
When used with epoxy glue, provides a permanent waterproof fixing for wooden spearguns, far superior to a self tapping screw.
Hex shaped shoulders lock into drilled hole. Blind end ensures zero water beyond insert.
M4 threaded size has total length of insert 15mm and OD 5.6mm.