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.
I assume this means: "Where can I find a torx screwdriver". Torx is a screw, with a hole looking like a six pointed star, or the star of David. You can find a Torx screwdriver in pretty much any hardware store, or well stocked super markets. They come in different sizes, so make sure you get the right size. They also come in the shape of Alan-keys, or hex-keys.
There are t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t15, and t20 sizes.
Torx is a family of screws/bolts, and their associated tools. They work very much like Allen screws, but instead of an internal hexagonal shape, Torx use a star shaped interface. The star shape can transmit more power than the hexagonal shape, protecting the user from stripping the bolt/screwheads. Just like Allen keys, Torx comes in several sizes, with T40 being one of them.
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I also have a 2000 grand Cherokee Laredo. Just changed front pads, and it is a torx bit T45. I couldn't find this answer on the web, so I bought several sizes to find out.
To turn Torx screws.
Slotted Phillips (cross shape) Torx (star burst) Robertson (square peg) Reid and Prince (thinner than a phillips) Awl Head (hexagonal)
You use them for Torx fasteners.
To turn Torx screws.
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