Specifications:
The document describes the technical specifications of double swivel castors with total locking and bolt with clamping ring, focusing on wheel selection and material composition. The wheels are available in different types, including plain bearing wheels and ball bearing wheels, with options for electrically conductive versions. The wheels feature grey, non-marking polyurethane tires and polyamide wheel rims.

Technical Data:
The housing is made of polyamide, and the swivel bearings are available with combined plain-ball bearings for diameters of 65 mm, 75 mm, and 100 mm, and precision ball bearings for diameters of 125 mm and 150 mm. Standard colors are signal grey (RAL 7004) and grey-white (RAL 9002).

Available Options:
Additional RAL colors are available upon request with minimum order quantities. Grey polyamide plain bearing wheels are available in diameters of 65 mm and 75 mm. Swivel bearings with precision ball bearings are available in a diameter of 100 mm. Cable guards are available from a diameter of 100 mm. Other mounting options are available upon request.

Applications:
The castors are suitable for use in medical, industrial, production, shop, service, office, and home environments.

Product Range:
The series includes models 550, 551, 551D, 552, 554, 557, 550H, and 551H. The document also mentions that the product has won a design award.

Additional Information:
Details on plate mounting dimensions and adapter sleeves are referenced to specific pages in the document.