ITEM NAME:11011 Racing Backplate Electric Starter E-Start Nitro Engine Back Cover - Description: Part Name: Power Starter Drill Plate For 16 18 21 size engine. Suitable for 1/10 HSP 94122 94188 RC Car Accessories. Part Number(s) referenced for this listing: 11011 11012. 100% Brand new and high quality Material: Plastic+Metal Size Chart: Size: 4.5*3.4cm / 1.77x1.33inch Hole centres 27mm square Package Includes: 1 Piece Electric Starter Back Plate Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thanks for your understanding! SKU: DMO0001167661017719.1 Piece Electric Starter Back Plate. Hole centres 27mm square.