A: steel or PVC cover type1. Small end dia is 50mm and the taper is 3. 6 degree. 2. Large end dia is different as per the roller's length. Rl=200 large end dia=62. 6Rl=300 large end dia=68. 9Rl=400 large end dia=75. 2Rl=500 large end dia=81. 5Rl=600 large end dia=87. 8Rl=700 large end dia=94. 1Rl=800 large end dia=100. 3B. common taper roller (pipe itself is taper) 1. Small end dia can be 38mm. Rl=200 large end dia=50. 6Rl=300 large end dia=56. 9Rl=400 large end dia=63. 2Rl=500 large end dia=69. 5Rl=600 large end dia=75. 8Rl=700 large end dia=82. 1Rl=800 large end dia=88. 32. Small end dia can be 50mm. Rl=200 large end dia=62. 6Rl=300 large end dia=68. 9Rl=400 large end dia=75. 2Rl=500 large end dia=81. 5Rl=600 large end dia=87. 8Rl=700 large end dia=94. 1Rl=800 large end dia=100. 3The length can be made as per yr requirement.