"Have been re modeling the back garden, using sleepers. These babies have kept everything in its place. Easily cuts through wood even without pre drilling, holds timber nice and tight. Out of about 400 used so far no bad ones. Even though they look thin, they are extremely tough.
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Review 2 for Timco In-Dex Wafer Head Timber Screws 6.7 x 175mm Pk50
"used for corner joining new 4" sleepers. pre drilled one sleeper, tap the screw through and then used 18 v cordless drill. used about 20 screws, all one one charge, no probs. recommend 175mm, 150mm would be too short to give good grip."