From Stridsland :
Pair of Stainless Steel M8 crank bolts with anodised aluminum self extractor caps
These do great at making any old cranks look real lovely, also making crank removal possible without a crank puller tool
Fit square tapered type cranks and bb’s
You can make your own pin spanner tool with an old spoke, bent into the shape of a “U”
Remember to use grease! You can add a small dab of Loctite on the cap threads if you want
Made in Taiwan