![](https://img5.grofrom.com/and-ensa.com/uploads/4.0HBfull1.jpg)
![](https://img5.grofrom.com/and-ensa.com/uploads/2.5HA1.jpg)
![](https://img5.grofrom.com/and-ensa.com/uploads/2.7HA1.jpg)
2.5HA
4.0HB full
2.7 HA
![](https://img5.grofrom.com/and-ensa.com/uploads/2.0HA11.jpg)
2.0HA
Standard cortical screws are used for diaphyseal bones, with a symmetrical head (3.5 + 4.5) and asymmetrical threads. Standard cancellous bone screws are used for metaphysis or epiphysis, with large outer diameter and deep thread. Lag screw technology has two mechanical components: 1 the circumferential force (friction force) along the thread, 2 the axial force when tightening, the screw screw or sliding hole allows the contralateral fracture block to be pulled toward the screw head.![](https://img5.grofrom.com/and-ensa.com/uploads/4.0HBfull1.jpg)
4.0 HB half
![](https://img5.grofrom.com/and-ensa.com/uploads/3.5HA.jpg)
3.5HA
![](https://img5.grofrom.com/and-ensa.com/uploads/4.5HA.jpg)
![](https://img5.grofrom.com/and-ensa.com/uploads/6.5HB-Full.jpg)
![](https://img5.grofrom.com/and-ensa.com/uploads/6.5HB-Half.jpg)
4.5HA
6.5HB Full
6.5HB Half