When it comes to tandem slides, the weight of each hole can actually vary quite a bit. In general, the weight of the holes on a tandem slide will range anywhere from 10 to 30 pounds. However, there are some tandem slides out there that have been known to have holes that weigh as much as 50 pounds. So, as you can see, the weight of the holes on a tandem slide can really vary depending on the specific slide that you have.