This is the Koswork 1/10 Buggy Adjustable Ride Height Gauge (12-22mm) (w/5mm block).
Features:
High quality aluminum material
Twist to get the height you want
Twists by 1mm increments in a range of 12~17mm
A 5mm add on is included to increase the range to 17~22mm
Large laser-engraved scale for easy identification
Compact and lightweight