Assembling the joint
Hardened steel self-tapping screws do not require pre-drilled pilot holes, even in hardwoods and laminated boards. Although other types of screws can be used, the type supplied with the Trend pocket hole jig are specifically designed for the purpose with integral washered cheese heads to prevent the screw pulling through the end-grain of the timber.
The jig is supplied with one short and one long square drive screwdriver bit (to suit square head Trend pocket hole screws) and one round shank pocket stepped drill bit. An alternative 'Snappy' Quick Release 3/8" drill bit is available as an optional accessory. Replacement packs of No 7 x 30mm square drive self-tapping screws are also available from Trend.
To ensure that corner joint faces remain flush during assembly, it is advisable to secure them against a right angle jig formed by clamping or screwing a high batten to a board or the edge of a workbench. Likewise to ensure that the faces of edge to edge joints remain flush, use the face clamp supplied with the jig; if necessary fitting larger plywood pads beneath the jaws to protect the faces of the work, and to spread the clamping area.