Bugle Head – Coarse Thread Bugle Head – Coarse Thread Fixing plasterboard to thin steel up to 0.75mm. M3.5 × 25 #6-9 × 1″ M3.5 × 32 #6-9 × 1-1/4″ M3.5 × 41 #6-9 × 1-5/8″ INQUIRY