Review on Walter 13C175 Crimped Mounted Brush by Alan Massey

I have verified that the brush shown here was actually shipped (Walter 13C175). The bristles of the brush are strongly attracted to the magnet, which tells me for sure it's not 304 stainless steel. I know some grades of stainless steel are actually magnetic, but this one is advertised as 304, so I'm not happy. However, the brush itself is well made, good quality and durable. The problem is that I need a stainless steel brush to polish 304 stainless steel welds! I contacted the manufacturer to find out what the brush is actually made of. If they reply I will update this review.