(click to enlarge) HUDY bearing presser adaptor for .21 engines made from black hardcoated 7075 T6 aluminum for unsurpassed lifespan and durability. All parts are CNC-machined for ultra-high precision. Lightweight design and compact size, easy and comfortable to use. For use with either of the following collets for .21 engines: • #107063 Collet 13mm for .21 RB & SH Engine Bearing • #107064 Collet 14mm for .21 Engine Bearing (click to enlarge)