High strain, in-line strainer with white insulator. strong galvanized steel ribbed, rust resistant frame holds a tapered die cast aluminum spool designed for ease of starting and wire alignment. two extra teeth on spool provide easier wire tightening action and control, requiring less clip turning to hook into next tooth. increased spool hub thickness provides extra strength to accommodate using up to 4mm gauge fence wire. clip lock operates with a smooth clicking action in any position. strainer handle spring ratchet #g69530 is required, not included. works on high tensile, barb and woven wire. polycarbonate plastic high strain insulator nested in the body of the strainer. easy to use upside down. high quality spring loaded locking clip, 5/8 in., 16mm square drive.