Pickup identification and switch function assistance

Hello, I hope you are all doing well. I am having dificulty finding information on a set of pickups that came in a $50 fixer upper guitar. The pickup set is a stratocaster style set which includes: 3 single coil pickups, 1 volume potentiometer, 2 tone potentiometers, 1 five way pickup selector switch, and 1 (what appears to be) DPDT on-off-on mini switch. I've attached an album with photos of the pickup set, as well as identifying marks on the components. The assistance I need is determining what type of pickups these are as well as what the DPDT mini switch does. The set does play well and sounds nice, I just want to know more information about it. As for part of assistance I am find with being refereed out to resources that have already addressed questions like this. Thank you for your help in advance.

Album: http://imgur.com/a/AQYfc If more information or photos are needed I am able to provide them.