$53.99 Aliexpress.com : Buy 3pc Hss Steel Step Cone Drill Titanium Bit Metal Wood Hole Cutter 3/16 1/2 
10 Step Drill Bit 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1 1/8, 1 1/4, 1 3/8 Titanium Step 
Craftsman 1/8 x 1/2 in. Step Drill Bit - For for sale online | eBay
![1 1 2 step drill bit](https://www.toolsource.com/images/prod_images/KTI71235_1200Wx1200H.jpg "Step Drill Bit 1/8\-1/2\")
