Wheel article of photos is 410R-6901RS producing by CNC lathe,with 8.8 degree bolt and nuts,one pcs 6901RS bearing.Wheel materal C45 steel.Color yellow or white zinc.
Main Size
Diamter:40mm
Thickness:10mm
Bolt:M8X30
Applicable diameter of 6 mm (inclusive) track or rope
Other similar products ,please see attached drawing. 

Explanation

My our company is professiona for sliding gate roller more than 15 years,and have design and producing capacity according to your request, drawings or samples .

Size Range:Diamete 30-500mm.Thickness 8-50mm,Groove "V","U","H",Bearing one or two,Suport inside or outer,and so on.

A PP plastic bags of a wheel, a carton of 100 wheels.,a pallet of 1500kg.
Carton logo with :ITEM NUMBER","QUANTITY" or with customer carton logo according to request.
Wooden Pallet size: 1100mmX1100mmx300mm.
Delivery time 20-30 working days after confirmation and deposit.