Additionally, with the outside cor- ners of the brad-point bit leading the cutting action, the wood fibers at the edge of the bore are cut for a cleaner hole. Brad-point bits are also effective in soft plastic, but are not generally used for metal because of their tendency to bind.
SPADE BITS For quick drilling of large holes, spade bits offer plenty of produc- tivity with their paddle-like shape. A typical spade bit is flat with two cutting edges flanking a spur, which guides the trajectory of the drilling. It should be noted that spade bits are intended for rough- in work such as framing, plumbing and electrical work, because their aggressive cutting and high-speed action can leave a splintery hole.
HOLE SAWS They’re called hole saws, but they fit on a drill—these cup- shaped bits cut out large circles or cores of wood for everything from plumbing to doorknob installation. Quality hole saws feature high- speed steel cutting edges bonded to a steel cup with the added advantage of variable pitch teeth. The repeating pattern of teeth and variable pattern gives smoother cutting in a variety of materials, when compared to the standard wavy pattern of teeth. Popular new hole saw acces- sories include quick-change adapter nuts and mandrels that work with almost any manufactur- er’s hole-saw cups. (Mandrels are the centering bit and support piece that hold the hole-saw cups.) The quick-change system makes it easy to change cups in seconds and move effortlessly between applications, sizes and materials. Users simply attach the adapters to their cups, drill a hole, and pull back on the mandrel to change cup sizes in seconds. The quick-change system also elimi- nates the time-consuming task of digging the plug out from the mid- dle of the cup.
The Kik spade bits from TG Tools are engineered with 30 percent more cutting surface. Plus, these spade bits eliminate the spur commonly found on similar bits, which allows them to drill curved holes for plumbing and electrical installations.
The Diablo 10-Piece Hole Saw Kit features five hole saw cups (bi- metal and carbide tipped) and Diablo's SnapLock PLUS mandrel system, including two pilot bits, for quick and easy hole saw cup changes. Photo © Diablo.
2-packs or 5-packs
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