Which timber to use for decking
Start by marking the drill holes for attaching the step to the stringer. Use the square to mark a centre line all the way across the stringer. Then measure the width of the step and mark that on the back of the stringer, to work out where your holes need to be. Mark 3 holes, 1 in the centre and 2 at either end. Repeat this step for the second stringer.
Put on the appropriate safety equipment and drill the 3 holes in the stringers using an 8-gauge countersink bit.
Apply PVA glue into the rebate. Slide the stringers into the rebate, ensuring that the grip/ripple side of the step is facing the right way up. Secure the step by using a drill driver with the supplied screws. Repeat the process for the other stringer.
Place the step where you want it to go. If the ground is uneven you might want to pour some concrete to make it flat. Mark the centre in the top of the stringer and pre-drill using your countersink bit. Use the impact driver and bugle head screws to secure the step to the deck.
If you want to leave the step natural, give it a light sand to remove the pencil marks. Or you can paint or stain it to blend in with your decking.