Specifications: 
Name :  chain rolloer 
Brand : TDPRO
Condition : 100% new
Color : Red
Bore diameter: 10mm  
Fitment :  

110cc-250cc DIRT MINI BIKE BUGGY ATV,
Suitable for all pit bike and dirt bike 420 or 428 size chains. Can also be used on gas petrol motorized bicycle conversions kits
Fits lots of the big name Chinese import pit bikes including Stomp, Demon X, M2R, Lucky MX, Pitster Pro, SSR, DHZ, Piranha, Braaap, WPB, Orion and many more
Feaures :
Pit Bike 10mm chain roller wheel complete with heavy duty bearings ready to use
This part attached the the swing arm; the chain then runs over it to keep it aligned

Package included:
2 x Chain Roller Guide Tensioner Runner