This engine mount kit fits BT-50, 55, 56 & 60 body tubes. Plus can be used to make a conversion mount for lightweight D powered rockets.

Technical Specifications
Includes: L/C Centering Ring Set 2055, L/C Centering Ring Set 2060, Engine Block Ring EB20A,1/4in Long BL Adapter Ring 2050, Bright Green Retainer Ring, 20 (MYLAR) Body Tube BT20 2.75in, White Body Tube BT20 White 2.75in, EH Slot Body Tube BT20 2.75in, White Green Split Adapter Ring Engine Hook EH-2A.