1.Perfect self-checking function 2.Four sides protect 3.Durable life 4.Good anti-vibration 5.Self-locking function SNA seriesProtection range, 0-8000mm;Specification SNAxx20 (xx=06, 08, 10, 12,40) SNAxx30 (xx=06, 08, 10, 12,40) SNAxx40 (xx=04, 06, 08, 10,40) SNAxx80 (xx=02, 04, 06, 08,40)Light axis pitch20mm, 30mm, 40mm, and 80mmProtection height Height=(xx-1)×light axis pitchSNAxx20 100,140,180, ...