This is a 2-1/4" Three-Blade Aluminum Spinner w/Aluminum Backplate from Tru Turn. FEATURES: Precision machined from barstock aluminum. Polished aluminum color with a brushed look. Easy to install, bolt-on design that centers spinner perfectly on its baseplate. Spinner cone is recessed to mate into the spinner backplate. The rear of the spinner is flat, without an overhanging cone. Includes 10-32 x 1" bolt for holding spinner cone to backplate. Adapter kits for different engine sizes are available separately. (See COMMENTS) Ninety day limited warranty INCLUDES: One Aluminum Spinner Cone One Aluminum Backplate (See SPECS For Sizes) One 10-32 x 1" Mounting Bolt One Tru Turn Decal Sheet One instruction and safety tips header card REQUIRES: One Spinner Adapter Kit (See COMMENTS) 4mm hex wrench for bolt SPECS: Spinner Backplate Diameter: 2-1/4" (57mm) Spinner Backplate Mounting Ring Thickness: 3/16" (5mm) Spinner Backplate Hole Diameter: 3/8" (9.5mm) Length From Back Of Backplate To Front Of Cone: 2-1/4" (57mm) Height Of Propeller Slot: 3/4" (19mm) Length Of Propeller Slot: 7/8" (22mm) Weight: 1.9 oz (55g) Prop Range: Up to a Zinger 11x8 3-blade Engine Range: Generally .25 - .61 cu in (4.1cc - 9.9cc) but can be slotted for nearly any prop/engine combo that will fit into the cone COMMENTS: Warning: Failure to follow the instructions printed on the card may cause the propeller to separate from model. The spinner cone must not touch the propeller at any point, only Tru Turn should modify the spinner. Spinner Adapter Kit will be determined by engine crankshaft size. Use one of the following: TRUQ3040: (1/4 - 28) (1/4" Bushing) (TT-0140-A) OS Max 20-60, K&B 19-65, Enya 25-53, HP 21-61, Fox 19-50, Webra 28-80, Irvine 20-61, Peco 21-45 TRUQ3045: (1/4" - 28) (7mm Bushing) (TT-0147-A) SuperTigre 25-60, Como 19-61, OPS 40-60 TRUQ3060: (5/16" - 24) (5/16" Bushing) (TT-516-A) OS Max 60FP, 61 FX & SF, SuperTigre 61-90 and G2300, Fox 60-120, Como 75-90 TRUQ3063: (5/16" - 24) (8mm Bushing) (TT-0518-A) OS Max 61-90 (2-Stroke), HP 120 (4-Stroke) TRUQ3066: (5/16" - 24 Jam Nut) (8mm Bushing) (TT-0522-A) OS Max 70-120 Surpass (4-Stroke) 140RX (2-Stroke), Abitar 120 (4-Stroke) TRUQ4010: (8 x 1.0mm) (8mm Bushing) (TT-0810-A) Enya R 120 (4-Stroke), OPS Super 60 & 61 5-Port, HP 120 (4-Stroke) TRUQ4015: (8 x 1.0mm Jam Nut Kit) (8mm Bushing) (TT-0814-A) YS 90-120 (4-Stroke) TRUQ4025: (8 x 1.25mm) (8mm Bushing) (TT-825-A) All YS (2-Strokes), OPS Maxi 30, Rossi 40-61, Peco 60-80, Webra 61-120 (All) TRUQ3065: (3/8" - 24) (No Bushing Required) (TT-375-A) OS Max 1.08, Maloney 1.00 & 1.25, Enya 2.40, Technopower (All), Brison (All) TRUQ3025: (10 x 1.25mm) (No Bushing Required) (TT-0125-A) Super Tigre 2000 - 3000 (4500 & 6000 12mm Reaming Required) (Not For The G2300, Use TRUQ3060) TRUQ3027: (10 x 1.25 x 50mm) (Hex Cap Screw-No Bushing) (TT-0127-A) Zenoah G-45 & G62 (10 x 1.25 x 55mm) (Hex Cap Screw-No Bushing) (TT-0127AL) MacMinarelli 70 & 85 TRUQ3047: (1/4" - 28 Jam Nut) (TT-0149-A) OS Max 26, 40, 48, 52 Surpass (4-Stroke) TRUQ3064: (5/16" - 24) (Long Jam Nut) (8mm Bushing) (TT-0520-A) OS Max 1.20 Flat Twin & Up TRUQ3068: (5/16" - 24 x 1-3/4") (8mm Bushing) (TT-0524-A) US Engines 35 & 41 TRUQ4035: (8 x 1.25 x 40mm) (8mm Bushing) (Hex Cap Screw) (TT0835A) Zenoah G-38 jxs 8/27/04 ir/jxs