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 & Wire Alignment, 2 Extra Teeth On Spool Provide Easier Wire Tightening Action & Control, Requiring Less Clip Turning To Hook Into Next Tooth, Increased Spool Hub Thickness Provides Extra Strength To Accommodate Using Up To 4 mm 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 & 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", 16 mm Square Drive.