Wood screw GS-F-W680
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Wood screw with a hex screw top used for attaching solar roof hooks to rafters. These come as standard with roof hooks. Also available separately here.
Requires a nut driver - 3/8" or 10mm to drill them in.
st6.3x80 M6 x 80mm available. M6 x 60mm now out of stock.
Price is per screw.