BK1-S500-250MA BK1-S500-250-R BK1-S500-3-15-R BK1-S500-315-R BK1-S500-500-R BK1-S500-50-R BK1-S500-5-R BK1-S500-630MA BK1-S500-630-R BK1-S500-6-3-R