Product Name : DC Geared Motor Bracket with Hex Coupler Fit Model for : 37mm Geared Motor Widely used in Mini 37mm series. DC geared motor to robot smart car wheels Hex coupler. Compatible with the motor shaft size 6mm diameter. Screws are not included. Bracket Size : 41x 40 x 48mm/ 1.6" x 1.6" x 1.9"(L*W*H) Big Hole Dia. : 27 x 13mm/ 1.1" x 0.51"(L*W) Small Hole Dia. : 3.5mm / 0.14", 3mm / 0.12" Hex Coupler Size : 18 x 12mm / 0.71" x 0.47"(L*Max.W) Coupler Fit Motor Shaft Diameter : 6mm / 0.24" Hex Hole Diameter : 4mm / 0.16" Screw Fixed Hole Diameter : 3mm / 0.12" Material : Metal Color : Black, Weight : 35g Package Content : 1 x DC Geared Motor Bracket 1 x DC Geared Motor Hex Coupler Note:Light and different displays may cause the color of the item in the picture a little different from the real thing.The measurement allowed error is +/-1-3 cm.