DOG TEETH

YOU ALL KNOW WHAT THIS IS? FOR THOSE WHO DONT THESE ARE DOG TEETH,THEY ARE USED TO PUT BETWEEN TO TIMBER JOIST BEFORE YOU BOLT THEM TOGETHER.THEY STOP MOVEMENT. IDEAL IF YOU HAVE 2 LENGHTS  OF TIMBER 10 FT AND YOU WANT THEM TO EXTEND THEM?USE THESE THEN BOLT ,,THOSE WHO DO ROOFING WILL KNOW ABOUT THESE? I FOUND ANOTHER USE WHICH I USE WHEN EVER I DO LATHE WORK.  SEE NEXT BLOG?