5/16"-18 x 3/8" 18-8 Stainless Pronged Tee Nuts TNSS-032 (10 pcs.)

Diameter: 5/16"
Diameter 2: 7/8"
Length: 3/8"
Material: Stainless Steel
Thread Size: 18 (Coarse)
Shape: Round
Hardness: 18-8
Style: Pronged
Type: Tee Nut
Prongs: 4

Box of 10.

Tee nuts are generally used in soft wood to provide a stronger surface for a screw or bolt to mount into.