Hi CharlieP75,
Our warehouse staff were not able to measure the internal depth of this product due due the packaging, but I believe the cutting depth should be at least 35mm as they have confirmed that the 12mm diameter part (i.e. excluding the hex shank) is 41mm long.
Thanks for using Screwfix Q&A. JT
Answered by: JTremain
Date published: 2018-06-23