Information from a Press Release from Sig:
The SigTac Tactical Auto is more than simply a frontline folder. It offers the same kind of automatic performance needed by anyone who puts a knife into immediate service- quickly and reliably. The blade is made of ATS 34 steel and coated with a wear-resistant Nitron finish (the same found on the Sig Sauer pistols). The Tactical Auto features a CNC machined billet aluminum grip and a spine safety lock. Partially serrated blade version.
Specifications:
Blade: 3.13"
Overall: 7.36"