Super lock sockets which are very handy for removing stubborn worn or rusty nuts and bolts.

The more pressure you put on them the more they will grip the nut or bolt.

Manufactured from Chrome Vanadium 

These also have knurled ring which greatly helps to grip them when they have grease and oil on them

Specifications:

Chrome Vanadium
Super lock
Polished and satin finish
Knurled grip
Professional quality
3/8’’ and ¼’’ drive
Bespoke plastic tray

Sizes:

3/8" Drive, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm
1/4" Drive, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm