This Metalnerd kit contains all nine known triple square (AKA 12-point) bolt sizes. Interested in knowing where these different sizes are found? Here’s a handy guide
from the folks at Metalnerd that’ll give some insight.
Included in this kit are:
1/4" drive M4 and M5 bits
3/8” drive M6, M8, M10, M12, and M14 bits
1/2" drive M16, and M18 bits, as well as a 90mm (~3.5”) long M10 bit which is perfect for accessing inner CV joint bolts.
To operate these bits are three sizes of chrome friction base – 1/4", 3/8”, and 1/2". The money saved by using chrome steel bases allowed Metalnerd to use the highest grades of tool steel on the bits. The M4, M5, M6, and M8 bits are made of S2 tool steel, the M10, M12, and M14 bits are made of SAE8660 tool steel, and the M16 and M18 bits are made of SAE6150 tool steel.
All 13 pieces are securely held in a durable blow-molded plastic case.
Please note that these bits are NOT impact tool rated, and they are NOT recommended for head bolt removal due to length and clearance issues.