Stop Collar
the stop collars can Be installed on any position on casing to limit the axial movement of Centralizers and cement baskets.
Stop collar is used to hold centralizers or Cement baskets on any position of casing, which ensures the positions of Centralizers or cement basket to meet the design. the stop collars are available In three types: knock-on type, Spiral nail type and Set screw type. the stop Collars can be installed on any position on casing to limit the axial movement of centralizers and cement baskets.

Technical description

Slip on set screw stop collar ring is a one-piece stop collar.

the outside ends of these heavy duty stop collar are  generally tapered to a degree(single piece develled/double develled)  which helps to hold the casing centralizer and avoid the ends to hit the  Bows / Vanes when the casing centralizers are placed over them.
this kinds of set screw stop collar is recommended for small hole operation.
It is used when holding force requirement is very high.
the Slip on Set Screw Stop Collar are available in sizes 4-1/2" to 20".