indian mill has advanced and refined the techniques for producing scaffolding planking and the tools needed to ensure jobsite safety. indian mill's pin-lok scaffold planking was designed to be the strongest - safest - most durable plank on the market. in our patented pin-lok process - multiple structural members of dense select grade southern yellow pine or douglas fir lumber are milled to size. the center strip is sealed to keep out moisture and job-site chemicals and aligned for the greatest possible strength. heat-treated twist steel pins are inserted every 22 inches along the plank length to bond the three pieces into a single solid unit. the resulting planking is stronger - more resistant to moisture and chemicals - and safer in overload than standard di-65 or laminated scaffold planking.