16mm long (5/8in): enough to go through the sleepers and thick underlay. Self tapping: will create their own thread into the wood.
Golden Valley Hobbies Track Screws O Gauge 16 mm long (x100)
Track screws OO gauge 6mm long (x100) GVH GVSCREWS6
Track Screws N Gauge 10mm Long (x100) GVH GVSCN10
Track Screws N Gauge 6mm Long (x100) GVH GVSCN6
Golden Valley GVSCN6 Track Screws N Gauge 6mm Long (Pk 100)
Laser Cut Track Templates O Gauge Model Railway Track Laying 5mm Acrylic or MDF