I got these bars with the intentions of having internal Di2 wiring for a sleek install. The picture on this site, as well as the pictures on the manufacturer website show the bars as having holes near the shifter mounts. This is not true - there are no holes present on these bars there. The only holes that aid in the internal Shimano Di2 wiring are on the very bottom of each side of the drops, and on the back side of where the stem clamps onto the bars. I even contacted the manufacturer and they confirmed that's how these Alloy bars are - only the carbon offerings having the holes to aid in internal wiring near the shifters. I'm very disappointed with that, but aside from that they are very well built, lightweight for alloy and look great.