ITEM NAME:Starter Drill Back Plate Cover Nitro Engine for HPI Infinity 18/21/27 Parts Description: Suitable for: Vertex 16/18/21/25cxp; SH 18/21 Japan-18cxp; 18/21/27 Nitro engine. Not suitable for engines larger than .18 (.19 + etc), Not suitable for 1/16 engines (.07 or .05 for example). For Vehicle Brand: HSP HPI Axial Himoto Wltoys, Any Other Brand Suits 12mm hex one-way bearing. Item NO.: 11012 Specification: Material: Plastic, Metal Size Chart: Hole center to hole center: 32mm/1.26inch. Package Includes: 1 Piece 11012 Drill Plate SKU: DMO0006509961017720.Suitable for: Vertex 16/18/21/25cxp; SH 18/21 Japan-18cxp; 18/21/27 Nitro engine. 1 Piece 11012 Drill Plate. Suits 12mm hex one-way bearing. Not suitable for engines larger than. 18 (.19 + etc), Not suitable for 1/16 engines (.07 or. 05 for example).