.18 / .21 SH Engine Pull Starter. To fit .18 and .21 SH Nitro Engines. May fit other cars below is the measurements please check before ordering.. 12mm Hex Fitting - 32mm Length - 32mm High - 27mm across the fixing holes - 15mm depth - to fit SH .18 and .21 starter rods only. Will not fit engines using a one way bearing. If you require the 19mm depth starter please click here. Other starters in stock simple ask and give the height length and the hex (nut size) of your current pull starter. Note: starter designed to fit SH engines or similar size (measurements above) SH starters dont feature a plate to secure the center string wheel. When removing tape please ensure the center does not fall out as this not covered by any guarantee or returns.