In Line Wire Strainer, 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 .15748", 4 mm, Gauge Fence Wire, Wire Can Be Threaded Through Strainer Instead Of Tying An Extra Knot, High Quality Spring Loaded Locking Clip, Works On High Tensile, Barb & Woven Wire.