I would use 3/8" by 6" long. That gives you 2" in the concrete 3" in the wood, and an inch for your washer and nut.
The best way to securely attach a shelf to a wall using a rawl plug is to drill a hole in the wall, insert the rawl plug, then screw the shelf bracket into the rawl plug. Make sure the rawl plug is the right size for the screw and wall material to ensure a strong and secure attachment.
10mm 12 point
You do not need special bolts. Standard bolts and screws, as long as they are the correct size, can be used.
A 20mm or 13/16 drill bit will allow the bolt to fit through.
should if the size matches up all u need is a adapter kit (plate) to align the bolts up to the housing. No.
To tighten the bolts on your bike pedals, you will need a 6mm allen wrench.
18mm
You need 54mm bore bolts for a caliper for a 1998 Chevy Prism.
On the drums there are two holes. You need to insert two to bolts (size 10 metric) in to the holes as yoo tighten the bolts it pushes the drum off. bolts need to be about 3 inches long. i could be wrong about the bolt size
Oil pan to Timing cover bolts are 8mm to remove them. as for replacing the bolts if they are lost, Metric 6.0 x 1.0 i believe
T55
Special bolts! Do not replace with generic will fit bolts! But the head size on my car is 18 MM