Here is a Facom 286A 1/2” drive stud remover with a capacity of 5-20mm. This is new old stock and I have had to open the packet to photo.

Please study the pictures. Thanks.

Facom 286A 1/2″ Drive Knurl-Type Stud Extractor 5-20mm Capacity

Facom 286A 1/2″ Drive Knurl-Type Stud Extractor 5-20mm Capacity

Heavy Duty Roller Type Stud Remover.

Covers sizes from 5 – 20mm diameter.

1/2″ Square Drive

Can be used to both tighten or untighten