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the only drawback is that i tend to use larger bits more. typical spade bit require a lot of force behind the drill to force them through. these bits are great. the threads on the end of these suck the bit right through the wood you are drilling into. i haven't even found a use for the smaller ones. it's a lot cheaper than going out and buying a hole hawg.
Definately drills quicker than a standard spade bit. Stalls once the self feed portion punches through joist or stud. An excellent drill bit especially in locations where constant pressure can not be maintained (overhead and reaching out). Needs high torque drill to work effectively but shaft bends easily if paddles bind or excessive/off center pressure is applied. Higher priced for a disposable bit but a real nice pouch. Have had the self feed pilot break off in denser woods.
I cannot confirm or deny this claim but they did cut quickly under specific conditions. Before clearing the sawdust the bit was noticeably less effective at drilling than cheap, regular spade bits. I purchased the 13 piece set of Bosch RapidFeed Bits from a local industrial supply company. After manually clearing the sawdust the bit would resume aggressive cutting with firm pressure.Using a 14.4V Cordless drill the bit would begin to pull in to the workpiece but quickly stalled at a shallow depth. The storage case is high quality with a velcro closure.The bits are touted to be 3X faster than conventional bits. If the screw tip did not pull the bit through the entire workpiece in one continuous motion and "spun" or stalled part-way through, the screw tip would pack with sawdust and essentially stop all cutting. The bit's screw tip should pull the bit through the entire workpiece in one continuous motion.2.
It is very similar to the 6 piece set except it has wider selection of bits and larger sizes. Using the 1" size on 2x10 joists, I found that two things needed to be true to get quick and/or remotely effective drilling:1. The drill's motor lacked the power to cut as fast as the screw tip pulled the bit into the workpiece.I believe these bits are a nice product but seem to be designed for tougher applications and work far better with more powerful tools. A drill far more powerful than a homeowner's-grade 14.4V cordless drill must be used.Using a potent 8 Amp, 120 VAC drill and firm pressure the bit performed well.
Excellent butterfly set, bored thru wood easily, bits showed no wear after use. Sizes are great for boring smaller holes for feeding wires thru studs, when rewiring. Bosch was an excellent choice, case makes it easy to store bits, and not fumble to find them later.
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