10-12 x 2-1/2 Flat Head, Phillips Drive, Type-A wood screw, 25 pack - White
The top of shank is smooth, no threads.

Screw Size: # 10 
Length: 2-1/2 inch 
Thread Pitch: 12 (0.171 inches UNC)
Thread: Type A, Coarse 
Screw Type: Wood Screw, Full Thread
Material: Steel
Screw Head Color: White
Sold in Packs of 25 

Note: Thread Pitch is the distance between threads.
UNC stands for unified course pitch threads whereas UNF stands for unified fine pitch threads.