Any goody two shoes can look away right now - the McPhail Devil shifter knob is not for you. As for anyone else, it would be a sin to ignore how much detail has gone into this truck shifter knob. Made of high quality urethane and topped with clear coat. Built-in 1/2-13 brass threaded insert. 3.25"L x 2"W x 2.25"H. Made in the USA. NOTE: Shift with care. Due to design and shape of this item, it is not intended for use as a shifter extension in any way and should not be subjected to extreme forces. Proper use insures long life of this custom accessory. Breakage NOT warranted. See more link for Installation Instructions. Recommended installation requires shifter adapter. Choose 13/18 Speed, item 238690 or 9/10 Speed, item 238691, sold separately.