As an industrial buyer, I have tried various biscuits and plugs, but these CAPLUGS rectangular steel plugs have surpassed all my expectations. The fit is snug and secure, and the material is sturdy enough to withstand tough industrial environments. According to my experience, they are the best quality steel biscuits and plugs available in the market. The only downside is that they are a tad bit pricey compared to other options, but the quality and reliability make it worth the investment.