Standard 1/4" bolts have a 3/8" head and and use a 3/8" square socket.
Some special 1/4" lag bolts with over-sized head - 7/16" head.
This product has minimum quantities.
500 piece discount = 20% off
1000 piece discount = 30% off
Square Head Lag Bolt Measurement Annotation: Lags Bolts - The diameter x length under the head
Head size is not included in standard annotations for lag bolts.