HAMLET Box Scraper by Dale Nish - HCT212 - 1" x 3/8"
£39.95
The makers say these box scrapers were designed by Dale Nish as his ideal internal box hollowing tools. This one is I believe one of the larger of the set - the 1" x 3/8" version, assuming the 3/8" refers to the width of narrowest part of the blade.