This is a Techna Clip Belt Clip, model P320BA.
Techna Clips gives you another option for concealed carry. The Techna Clip is a high carbon spring steel IWB belt clip that installs easily on your pistol and permits carry without the added bulk of a holster. Its light weight and allows for a fast draw. No gunsmithing is required to install. Each Techna Clip comes with all the hardware you need to install it on your specific gun.
Features:
Inside the Waistband Belt Clip
Right Handed
High Carbon Spring Steel
Easy installation
No permanent modification of firearm
Includes grip replacement screws
Fits Sig Sauer P320