Do it #10 x 3-1/2 In. Green Star Bugle-Head Wood Deck Screw (5 Lb. Box) Fein whichever comes first

whichever comes first

circular saws

and thin coat backing board

Sides interlock with center panel to form a tongue and groove connection

Do it #10 x 3-1/2 In. Green Star Bugle-Head Wood Deck Screw (5 Lb. Box) Fein whichever comes firstGreen exterior screw 6 lobed, star drive provides quick bit engagement and greater torque control. Countersinking bugle head prevents heads from popping out and leaves smooth finish. Extra coarse thread. Type 17 point. Features PrimeGuard Plus proprietary polymer coating that protects the fastener against corrosive elements. Lifetime Guarantee. Use on decks, fencing, siding and other general exterior projects. Ideal for use with pressure treated