A T60 or T65.
T55 TORX BIT ON THE FRONT 12MM SOCKET ON THE REAR!
55
Torx is a 50 and they are really tight.
You will need a T55 Torx bit to remove the front caliper of a 2001 Silverado 1500. A torx bit is a screw with a six point star shaped head. These come in different sizes.
T - 55 TORX, Across the board for similar GM's.
44
T55
Actually it is not a Torx bit -- it is a hex. I believe it is the largest one usually included with Hex sets.
T55
To remove the front brake caliper on a 1998 Chevy Silverado, you will typically need a T55 Torx bit. This size is used for the caliper mounting bolts. Always ensure you have the correct tools and verify the size, as variations may exist depending on specific models or aftermarket parts.
If it's the same as a 2003 1500 series (which I'm sure it is) it should be a T-55 torx bit. This is what it is...
T60. It's a torx bit.