This is the Duratrax black nylon body 2.5 post.
Features:
Includes: Two mounting posts, two collars, two set screws (4-40x1/8, use 0.050 hex wrench) and two mounting screws (4-10x3/8 flat-head, use 1/16 hex wrench)
Specs: These are adjustable from 2 to 2.5 in height
Requires: Body Clip Pins, 0.050 Hex Wrench and 1/16 Hex Wrench