The REDS Engine 12mm Engine Bearing Tool Kit for .21 size engines was developed for nitro racers that want to perform critical maintenance on their nitro engines. The kit includes a puller for 7mm and 14mm bearing removal and a presser for installation. The presser is made from high-quality Hard Coated Spring Steel. The bearing surfaces are ground for high precision bearing installation. The innovative rear bearing puller is made with Hard Coated Spring Steel and aluminum for unsurpassed lifespan and durability. All parts are CNC-machined for ultra-high precision. The lightweight design and compact size, make this tool easy and comfortable to use.