SKF FY20 TF Flanged Housing Unit - 20 mm ID Bicycle Tool but they are essentially to

but they are essentially to provide a better protection and grip for your tools

Adapter insert ror the use of square plug-in tools 14x18 mm in torque wrenches with internal square 9x12 mm

Extremely high spread range due to variable mounting of the jaws

including yokes 86 kg (189 lbs) Maximum power consumption 10

The magnet can be pushed back and thereby neutralised

SKF FY20 TF Flanged Housing Unit - 20 mm ID Bicycle Tool but they are essentially toFlanged Housing Unit sealed design Flanged Housing Units from SKF are designed for reliable performance in demanding industrial applications. The sealed design provides protection against contamination. Suitable for use in a wide range of industrial applications where reliability and performance are essential.