Description of Lichamp 21-Piece Cobalt Stainless Steel Hardened Toolkit
UNIQUE 3X FLUTE DESIGN - Lichamp three flute patent design drill bit clears chips and particles faster, provide you with more efficient drilling experience. 4X LIFESPAN MATERIAL - Made from industrial grade M35 high-speed steel with 5% cobalt provides hardness for wear resistance, withstands max 1100 degreeF. MULTIPLE APPLICATION - Ideal for drilling in heavy-duty tough metal, including hard abrasive alloy metal, hardened stainless steel or cast iron. SMOOTHLY DRILLING - 135-degree split point tip & twist design increases cutting speed with self-centering and prevents skating starts or walking. 21PCS DRILL BIT SET - Metal index case with size chart for easy bit access and identification. Includes drill bit sizes 1/16-inch to 3/8-inch in 1/64-inch increments.
They were packaged well but two bits broke the first time they were used on thin galvanized steel. I'm not a contractor, but I often use drill bits for DIY projects and have never broken a drill bit. To be honest I've never drilled into this type of metal before so it might have been user error but I think it's unlikely.
Pros
UNIQUE 3-CUT DESIGN - Lichtamp's 3-flute drill bit with patented drill bit design removes chips and particles faster for more efficient drilling.
later They seem solid and straight. What annoyed me the most about these drill bits is that they are all significantly smaller in diameter. Why can't Chinese manufacturers learn how to use calipers and tune their tools? They have some trouble turning because they may be the right size. Will not buy again due to this problem. I'm more comfortable with regular precision sized drill bits.
Pros
SMOOTH DRILLING - 135 degree split-point tip and curved design increases cutting speed by self-centering and prevents slipping or walking.
I really like these drills. I've been a mechanic for 45 years now and a friend recently introduced me to this type of drill. I bought them hoping I wouldn't need them. Then, on the final torque pass of the complex assembly, I had a bolt click. The drill drilled through hardened grade 8.8 steel as well as aluminum. Careful use of the easy exit has saved me hours of disassembly. I cannot recommend them enough.
Pros
MULTIPLE APPLICATIONS — Ideal for drilling tough carbides including hard abrasive alloys, hardened stainless steel or cast iron.