Zipbolt UT Rail Bolt - Stair Builder Pack Treads Tread Depth / Width =

Tread Depth / Width = 4-1/2" x 14"

this feature alone is very significant to making this product very user friendly

4 - Angled Slipfix Rail Bolts

and stronger

Depth: 11-1/2"

Zipbolt UT Rail Bolt - Stair Builder Pack Treads Tread Depth / Width =This Pack includes 15 Bolts and 2 5mm Hex Drivers and written instructions with a hole marking template. The Zip Bolt UT Gear Driven Rail Bolt uses the same boring configuration as bolts that have been used for centuries past, but with a very big difference. The use of a heavy duty threaded insert, bolt, and a new type of gear driven nut assembly simplifies the whole process of joining the parts together. This bolt will help you save time and money