This 8-way hand operated turntable allows a train to switch over to different track lines when you turn the crank.This piece includes 4 male and 4 female connectors and works with the Maxim roundhouse (MX50946, sold separately).The diameter of the inside rotating portion is approximately 8.3cm .Manufactured by Maxim Enterprise from 100% hardwoods.Compatible with Thomas the Train, Brio and other fine wooden train sets and accessories.Made in China.15cm