The popular Crain 505 Knee Kicker (popular because it is the cheapest Crain kicker).

FEATURES

It has three nap grips and four rows of hardened steel pins. Pins are adjustable to 9 different depth settings to dial in the perfect height for any carpet kicking application. Internal power rods support the pin plate. Adjusts from 21 inches to 25 inches. The Crain 505 Knee Kicker adjusts from 21" to 25" with its telescoping tubular body. 16 hardened steel pins have 9 different height adjustments for any carpet. 

Replacement Parts

Net weight: 5.88 lbs. Replacement bumper: Part No. 1505-01. Replacement gripper inserts: Part No. 1505-K. Replacement pin plate: Part No. 1601-B.