Main Rotor Holder Set HS1070Main rotor holder with triple bearings Use for T-REX450X/XLSpecification: Main rotor holderx 2Bearing 693ZZ x 4(3x8x4mm)Bearing MR63ZZ x 4(3x6x2.5mm)Socket screw x 2(M2x5)Washer x 2(M2)Linkage ball x 2Cross screw x 2(M2x6.5)Aluminum collar x 2(Φ5xΦ3x1.5mm)