Strong galvanised steel ribbed rust-resistant frame holds a tapered die cast aluminium spool designed for ease of starting and wire alignment. Two extra teeth on spool now provide easier wire tightening action and control, requiring less clip turning to hook into next tooth. Increased spool hub thickness to larger than standard hub provides extra strength to accommodate using up to 4mm gauge fence wire. Smooth clicking action. Easy to use upside down wire can be threaded through strainer instead of tying an extra knot. High quality spring loaded locking clip 5/8″ (16mm) square drive. Wire can be tightened using ratchet strainer or similar tool. Frame designed to maximise spark distance.